Ventricular arrhythmias are abnormal heartbeats that originate in your lower heart chambers, called ventricles.

Addison's disease is a disorder that occurs when your body produces insufficient amounts of certain hormones produced by your adrenal glands.

A kidney stone, also known as a renal calculus (from the Latin r n s, "kidneys," and calculus, "pebble"), is a solid concretion or crystal aggregation formed in the kidneys from dietary minerals in the urine.

False labor: pains resembling those of normal labor but occurring at irregular intervals and without dilation of the cervix.